2018 Buick Encore engine problems

Filed Nov 2, 2026 · Engine · 55,753 miles · MN

The contact owns a 2018 Buick Encore. The contact stated that while driving, the vehicle ran rough and sputtered. The check engine warning light failed to illuminate following a deep cleaning service. The vehicle was taken to the dealer for inspection and repair. The dealer identified software failures associated with DTC: P162B and DTC: P111E, and performed software updates. The contact stated that a leak occurred in the positive crankcase ventilation (PCV) system associated with DTC: P0171. The dealer replaced the intake manifold, vapor canister purge valve, and PCV component, stating that no leaks were found during the inspection. The contact had the removed parts inspected by an independent mechanic, who found an internal leak. The contact stated that the OnStar system indicated that the check engine warning light was illuminated, and an abnormal exhaust odor emanated from the vehicle. While driving, the driver experienced drowsiness and expressed concern regarding carbon monoxide exposure. The contact stated that the tailpipe was damaged and expressed concern regarding warranty coverage for the turbocharger and catalytic converter. The manufacturer was notified of the failure regarding DTC: P0029, but declined warranty coverage. The contact believed that the failures were associated with Special Coverage Programs: N232395320 and N192211170. Although repairs and software updates were performed, the contact remained concerned that the underlying mechanical failures were not properly diagnosed or resolved, and that PCV, turbocharger, and exhaust failures caused reduced engine performance, cabin exhaust fumes, and risk of carbon monoxide exposure. The failure mileage was approximately 55,753.

Filed Aug 2, 2026 · Engine, Fuel system · NC

Not long after I purchased my car, i noticed it was lacking power during takeoff and when driving uphill which forced my car to hit very high RPMs during normal use. There was also a P0299 code that appeared then disappeared frequently. I discovered a turbo special coverage N232395330 and took it to Williams GMC in Charlotte. After i told them very clearly what happened MULTIPLE times, confirming the underboost and the code, I even brought it in with the code, they told me the code wasnt "active" and that there no problems...even after i told them I didnt feel safe and couldnt pull out at intersections with fear of being rear-ended. I had videos, they refused to look at and told me to come back when the code was permanent. I drove the vehicle for the next year, 20k miles in order to get the code permanent, after a trip home, through the mountains, really tough without the turbo, my car was consistently pinging 4-5000 RPM under the speed limit on inclines...this happened every time I drove through, but this time the code was active the entire time. 2-3000 miles with the code, finally it was permanent. I brought the car back to Williams GMC, to get the turbo changed. I updated them on recent occurrences, flashing check engine light, the code active for 2-3k miles, and they performed a road test, and declared it wasn't a problem. I told them i recently spent 5k on repairing my cooling and AC system because the turbo, they said that wouldn't affect those components, meanwhile i know they have plastic parts that can melt and the engine being forced to push 4-5k RPM the extra heat could easily melt those parts. They said, nothing was wrong and the road test was good. sent me on my way. I called corporate, they told me to get a second opinion. I did [XXX] found the problem and changed the turbo per the special coverage N232395330. a week later, my engine overheated, i pulled over and it wouldnt start, engin won't hold compression. Car is tot now. Long story shrt INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORM

Filed Jul 31, 2026 · Engine · NH

General Motors issued a Special Policy N202299080 covering 2014 Buick Encores. My 2018 Encore had the same issues and symptoms as this Policy. My concern is because of this known problem the crankcase can be pressurized causing oil leaks which could cause a fire. General Motors issued a Service Information Bulletin 19-NA-114 in May 2019 about involving 2013 to 2019 Buick Encores. This is a known issue for many models other than my vehicle. I have the old parts from the repair for inspection which includes the Intake Manifold and the Valve Cover for faulty PCV components that cause the engine to produce excess Engine Crankcase pressure possibly causing a fire. My vehicle had a check engine light code of P0171 and the odor of burning oil.

Filed Jun 10, 2026 · Engine · PA

Request for Goodwill Assistance – Turbocharger Failure (Special Coverage XXX) Dear General Motors Customer Assistance, I am writing to request a one-time goodwill repair for my 2018 Buick Encore (VIN: [XXX]). Approximately two months after purchasing this vehicle, the check engine light illuminated and diagnostic testing identified code P0299, indicating turbocharger failure. This issue appears to align with General Motors' Special Coverage Program XXX, issued in February 2024 for certain 2017–2018 Buick Encore vehicles equipped with the 1.4L engine due to known turbocharger failures. Unfortunately, my local GM dealership has informed me that they are unable to perform the repair under the special coverage because the vehicle carries a Pennsylvania reconstructed (R) title. While I understand the vehicle's title status, I respectfully ask GM to consider the unique circumstances. In Pennsylvania, reconstructed vehicles must undergo a rigorous Enhanced Vehicle Inspection process before they can be legally registered and operated on public roads. My vehicle successfully passed all required inspections and is legally certified for highway use. Because this special coverage was issued to address a defect that may lead to significant engine damage and, in some cases, a potential engine compartment fire, I am requesting a one-time goodwill repair or other assistance from General Motors. The concern involves a known condition affecting this vehicle platform and presents a potential safety risk during both local and highway driving. I have been a loyal GM customer and would greatly appreciate your review of this situation. Given that the vehicle has been properly repaired, inspected, and approved for road use under Pennsylvania law, I respectfully request that GM reconsider eligibility for assistance despite the reconstructed title designation. Thank you for your time, consideration, and any assistance you may be able to provide. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B

Filed Jan 22, 2026 · Electrical, Engine · KS

Was driving and lost complete power but came right back on itself. Car also makes a loud noise periodically when reversing and pressing the brake. Was told this was engine timing chain. Cooling fan periodically stays on draining the battery after car is turned off. None of these issues have been correct but told there is no recall to fix these issues.

Filed Jan 2, 2026 · Engine · AZ

After filling up fuel vehicle starts and stalls out. This occurs while driving at stop signs. And also while driving loss of power. There is something wrong in the engine, timing belt, fuel, etc.

Filed Nov 14, 2025 · Engine · NH

Brought my car to get an oil change and was told they could not do it as my oil filter housing unit is cracked and leaking oil they said to check for recalls as this is an issue with other vehicle same problem. Upon checking i was informed that Buick is not making this a recall item at this time. They put in enough oil for me to get home.

Filed Nov 11, 2025 · Engine · OH

Component failure: the engine timing chain. Yes, it is available for inspection. Safety risk: vehicle hesitated and lost power in traffic, causing my vehicle to automatically slow down where I was no longer driving at the speed limit. My safety and other drivers around me was compromised as this could have caused a major accident should I have been rear ended. I had it towed to lambert buick, cuyahoga falls, ohio. They diagnosed a timing chain malfunction which was confirmed by dealership diagnostic testing. I was advised not to drive vehicle due to engine damage potential. I had it towed back to my home and have not driven it since. Vehicle has not been inspected by the manufacturer, police, insurance or anyone else. There was no warning, messages or any symptoms prior to the engine timing chain issue. A warning light only came on when the car hesitated and lost power in traffic.

Filed Nov 10, 2025 · Engine · 98,507 miles · OH

The contact owns a 2018 Buick Encore. The contact stated that while driving at an undisclosed speed, the vehicle inadvertently lost motive power. The contact was able to coast to the shoulder of the roadway, where the vehicle failed to restart. The check engine warning light was illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the timing chain, resulting in damage to the crankshaft. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 98,507.

Filed Aug 19, 2025 · Engine · LA

Engine stalls, intake hose, power issues, multiple oil leaks